Round back open window economy tab



FIG. 1 is a perspective view of our new, original and ornamental design for a round back open window economy tab;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a back elevational view thereof. 

The ornamental design for a round back open window economy tab, as shown and described. 